题解 | #计算日期到天数转换#

计算闰年的地方可能麻烦了点。

year, mount, day = input().split()
year, mount, day = int(year), int(mount), int(day)

long = [1, 3, 5, 7, 8, 10, 12]
if not year % 100 and not year % 400:
    feb_days = 29
elif year % 100 and not year % 4:
    feb_days = 29
else:
    feb_days = 28


days = 0
for i in range(1, mount):
    if i in long:
        days += 31
    elif i == 2:
        days += feb_days
    else:
        days += 30
days += day
print(days)